Vacuum cleaner



FIG. 1 is a front elevational view of a vacuum cleaner showing my new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is an elevational view of the side opposite to that in FIG. 2; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a vacuum cleaner, substantially as shown and described. 